Never heard of it but anything can be used in your skippy that allows lots of bio bugs to form in the tiny cells. People have used, floor scrubber pads, filter media, quilt batting, kitchen scrubbies, sponge pieces, strapping, lava rock, and probably lots more things. Having used the scrubbies, which worked fine, I really prefer the floor scrubber pads. They hold up really well and are easy to shape, fit together well, and clean with a power washer.